Jack



FIG. 1 is a perspective view of top, front and right side of a jack showing my new design;

FIG. 2 is a perspective view of the bottom, rear and left side thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a rear elevational view thereof; and,

FIG. 8 is a left side elevational view thereof. 

The ornamental design for a jack, as shown. 